:root {
  --fg: #1b1b1b;
  --muted: #6b7280;
  --line: #e2e2e2;
  --accent: #2563eb;
  --danger: #b91c1c;
  --bg: #fafafa;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  color: var(--fg);
  background: var(--bg);
}

header {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  padding: 0.75rem 1.5rem;
  border-bottom: 1px solid var(--line);
  background: #fff;
}

.brand { font-weight: 700; text-decoration: none; color: var(--fg); }

nav { display: flex; gap: 1rem; align-items: center; margin-left: auto; }
nav a { text-decoration: none; color: var(--accent); }

main { max-width: 820px; margin: 2rem auto; padding: 0 1.5rem; }

h1 { font-size: 1.4rem; }
h2 { font-size: 1.1rem; margin-top: 2rem; }

table { width: 100%; border-collapse: collapse; margin: 1rem 0; }
th, td { text-align: left; padding: 0.5rem 0.6rem; border-bottom: 1px solid var(--line); vertical-align: middle; }
th { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }

code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 0.9em; }

.card {
  display: grid;
  gap: 0.75rem;
  max-width: 480px;
  padding: 1.25rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

label { display: grid; gap: 0.25rem; font-size: 0.9rem; color: var(--muted); }
input, select, textarea {
  font: inherit;
  padding: 0.45rem 0.55rem;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}
textarea { font-family: ui-monospace, monospace; }

button {
  font: inherit;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--accent);
  border-radius: 6px;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
}
button.danger { border-color: var(--danger); background: var(--danger); }
button.link { border: none; background: none; color: var(--accent); padding: 0; }

.inline { display: inline-flex; gap: 0.4rem; align-items: center; margin: 0; }
.muted { color: var(--muted); }
.error { color: var(--danger); }